CN108446829A - A kind of heat-exchangers of the plate type efficiency evaluation method - Google Patents
A kind of heat-exchangers of the plate type efficiency evaluation method Download PDFInfo
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Abstract
The present invention relates to a kind of heat-exchangers of the plate type efficiency evaluation methods, include the following steps：Obtain the efficiency parameter of heat-exchangers of the plate type；Efficiency characteristic function is established based on the net energy that heat-exchangers of the plate type is exchanged using the efficiency parameter；The optimal overall heat-transfer coefficient for determining heat-exchangers of the plate type obtains optimal energy efficiency indexes in conjunction with the efficiency characteristic function.The present invention can obtain optimal energy efficiency indexes and efficiency evaluation index, and the thermal-design for high efficiency plate heat exchanger provides basis.
Description
Technical field
The present invention relates to heat exchanger efficiency evaluation technical fields, more particularly to a kind of heat-exchangers of the plate type efficiency evaluation
Method.
Background technology
Heat exchanger is the equipment that the partial heat of hot fluid is passed to cold fluid.Heat exchanger is in chemical industry, oil, dynamic
Occupied an important position in power, food and other many industrial productions, be develop and use industrial secondary energy sources, realize waste heat recovery and
Still, heat exchanger itself is also big power consumer to the capital equipment of energy-saving and emission-reduction.Plate heat exchanger is by a series of metal film stacks
A kind of high-performance heat exchanger made of dress forms thin rectangular shape channel between various plates, heat exchange is carried out by plate.It is board-like to change
Hot device is that liquid-liquid, liquid-vapour carry out the ideal equipment of heat exchange.Heat-exchangers of the plate type product has heat transfer efficiency height, structure tight
Gather, be light-weight, floor space is small, is simple to manufacture, economical and practical feature, be widely used in petrochemical industry, machinery, metallurgy, electricity
The fields such as power, food and municipal heat supply are one of the energy saving heat exchange products that state key is promoted.
There are many evaluation methods and evaluation index of heat exchanger performance at present.There are overall heat-transfer coefficient K and pressure drop Δ P to be used as to comment
Valence index, or evaluated using K/ Δs P and the Nu/f of zero dimension.And K/ Δs P1/3And Nu/f1/3As index.
Also use entropy orEtc. the evaluation index that is used as of parameters.
These above-mentioned evaluation methods have simple based on First Law, and the energy of static analysis heat exchanger is in quantity
The case where upper conversion, transmission, utilization and loss.Currently, the appraisement system based on the first law of thermodynamics is still in heat-exchange system
Evaluation in be widely used.Also there is the evaluation method based on the second law of thermodynamics, consider energy in heat exchange process
Loss in quality is evaluated to analyze the conversion in heat transmission equipment, transmission, utilization and loss as the second law of thermodynamics
The entropy generation minimization method that system represents, is applied in many research.Under the conditions of commonly used, heat exchanger measurement condition
With the temperature levels of applying working condition may very different, and flow entropy increase, damage increase than Heat Transfer Entropy, damage small 1~2 quantity respectively
Grade.And for different commercial Application processes, the practical entropy of pursuit increases, damages purpose difference, therefore such evaluation method cannot be accurately anti-
Reflect efficiency feature.In addition to this, for above-mentioned evaluation method mostly based on experiment, experience etc., theoretical property is not strong, and is all to stop
On static evaluation, the optimal value of a certain index is not provided yet.So provide a strong dynamic evaluation method of theoretical property and
Index is just particularly important.
Invention content
Technical problem to be solved by the invention is to provide a kind of heat-exchangers of the plate type efficiency evaluation methods, can obtain most
Excellent energy efficiency indexes and efficiency evaluation index, the thermal-design for high efficiency plate heat exchanger provide basis.
The technical solution adopted by the present invention to solve the technical problems is：A kind of heat-exchangers of the plate type efficiency evaluation side is provided
Method includes the following steps：
(1) the efficiency parameter of heat-exchangers of the plate type is obtained；
(2) efficiency characteristic function is established based on the net energy that heat-exchangers of the plate type is exchanged using the efficiency parameter；
(3) the optimal overall heat-transfer coefficient for determining heat-exchangers of the plate type obtains optimal efficiency in conjunction with the efficiency characteristic function
Index.
Further include calculating efficiency ratio using efficiency characteristic function and optimal energy efficiency indexes to determine plate after the step (3)
The step of formula heat exchanger efficiency hierarchical level.
Efficiency parameter in the step (1) includes that the mean temperature difference of cold and hot two side liquid of heat-exchangers of the plate type, fluid change
Hot area, cold-side fluid pressure drop, hot side fluid pressure drop, cold-side fluid sectional area, hot side fluid cross-section product, cold-side fluid stream
Speed and hot side fluid flow rate.
The efficiency characteristic function of foundation is in the step (2)
Wherein, K is overall heat-transfer coefficient,h1For cold side convective heat-transfer coefficient,u1For cold-side fluid flow velocity, b1
It is cold-side fluid flow velocity to the structure variable of cold side convective heat-transfer coefficient, a1It is cold-side fluid flow velocity to cold side convective heat-transfer coefficient
Amplitude variations, h2For hot side convective heat-transfer coefficient,u2For hot side fluid flow rate, b2It is hot side fluid flow rate to heat
The structure variable of side convective heat-transfer coefficient, a2It is hot side fluid flow rate to the amplitude variations of hot side convective heat-transfer coefficient, Δ tmFor plate
The mean temperature difference of cold and hot two side liquid of formula heat exchanger；A0For fluid heat transfer area；ΔP1For cold-side fluid pressure drop, Δ P2For
Hot side fluid pressure drop；A1For cold-side fluid sectional area, A2It is accumulated for hot side fluid cross-section.
Advantageous effect
Due to the adoption of the above technical solution, compared with prior art, the present invention having the following advantages that and actively imitating
Fruit：The present invention gives efficiency characteristic function according to the net energy of heat exchanger heat transfer process obtained, and calculates optimal
Energy efficiency indexes and efficiency evaluation index build the efficiency evaluation system of heat-exchangers of the plate type, and by efficiency characteristic function
Analyze the energy efficiency indexes that obtain, more can objective reaction heat exchanger efficiency situation, additionally dynamic it is corresponding to react heat exchanger
Relationship between variable is more advantageous to and reaches optimization design heat exchanger by thermal-design to optimize heat exchanger designs variable
Purpose.Consideration of the present invention is comprehensive, strong operability, and the efficiency that can accurately evaluate heat-exchangers of the plate type is horizontal, for
It is horizontal to improve the running efficiency of heat-exchangers of the plate type, promotes the exploitation of novel high-efficiency and energy-saving heat-exchangers of the plate type, manufacture and answer
With with directive significance.
Specific implementation mode
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention
Rather than it limits the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, people in the art
Member can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited
Range.
Embodiments of the present invention are related to a kind of heat-exchangers of the plate type efficiency evaluation method, include the following steps：Obtain plate
The efficiency parameter of formula heat exchanger；Efficiency spy is established based on the net energy that heat-exchangers of the plate type is exchanged using the efficiency parameter
Levy function；The optimal overall heat-transfer coefficient for determining heat-exchangers of the plate type obtains optimal energy efficiency indexes in conjunction with the efficiency characteristic function.
Wherein, efficiency parameter includes mean temperature difference, fluid heat transfer area, the cold side of cold and hot two side liquid of heat-exchangers of the plate type
Fluid pressure drop, hot side fluid pressure drop, cold-side fluid sectional area, hot side fluid cross-section product, cold-side fluid flow velocity and hot side stream
Body flow velocity.Above-mentioned efficiency parameter can be come in the cold and hot both sides setting temperature sensor of heat-exchangers of the plate type, current meter, pressure sensor
It obtains.Fluid heat transfer area, cold-side fluid sectional area, hot side fluid cross-section product can then be measured by survey tool.
Efficiency characteristic function is that the heat exchanger of progress efficiency evaluation exchanges the net energy of (acquisition), that is, exchanges and (obtain
) energy subtract the pump work lost by heat exchanger cold side and hot side pressure drop.Specially：Wherein, K is overall heat-transfer coefficient,h1For cold side convection current
Heat transfer coefficient,u1For cold-side fluid flow velocity, b1The structure of cold side convective heat-transfer coefficient is become for cold-side fluid flow velocity
Amount, a1It is cold-side fluid flow velocity to the amplitude variations of cold side convective heat-transfer coefficient, h2For hot side convective heat-transfer coefficient,u2For hot side fluid flow rate, b2It is hot side fluid flow rate to the structure variable of hot side convective heat-transfer coefficient, a2For heat
Side liquid flow velocity is to the amplitude variations of hot side convective heat-transfer coefficient, Δ tmFor the average temperature of cold and hot two side liquid of heat-exchangers of the plate type
Difference；A0For fluid heat transfer area；ΔP1For cold-side fluid pressure drop, Δ P2For hot side fluid pressure drop；A1For cold-side fluid section
Product, A2It is accumulated for hot side fluid cross-section.
Optimal overall heat-transfer coefficientWherein, Δtm1For the mean temperature difference of cold-side fluid and cold and hot side contacts wooden partition；Δtm2For hot side stream
The mean temperature difference of body and cold and hot side contacts wooden partition.
To needing the heat-exchangers of the plate type of efficiency evaluation, it is Δ E to calculate its efficiency characteristic function, and with optimal energy efficiency indexes
ΔE*It is compared, calculates efficiency ratio
It by many experiments and statistical analysis, and uses for reference and has research method, by heat exchanger energy efficiency Comprehensive Assessment rank
It is set as Pyatyi, level-one to Pyatyi efficiency level indicates that it accordingly reaches high level, higher level, medium level, relatively low water respectively
Gentle low-level.Level-one efficiency is horizontal, two level efficiency level can be set to the product actively promoted and applied, and three-level efficiency level belongs to
It can continue the product of application, level Four efficiency level belongs to the product of limitation application, and Pyatyi efficiency level, which belongs to, orders superseded production within a certain time
Product.The grade scores table of heat-exchangers of the plate type efficiency level is shown in Table 1.
The horizontal rank grade form of 1 heat-exchangers of the plate type efficiency of table
It is not difficult to find that the net energy that is obtained of the present invention according to heat exchanger heat transfer process, gives efficiency feature letter
Number, and optimal energy efficiency indexes and efficiency evaluation index are calculated, the efficiency evaluation system of heat-exchangers of the plate type is built, is had higher
Logical Deriving rationality, and the energy efficiency indexes obtained are analyzed by efficiency characteristic function, more can objective reaction heat exchanger energy
Situation is imitated, additionally the relationship between dynamic reaction heat exchanger relevant variable, is more advantageous to and optimizes by thermal-design
Heat exchanger designs variable achievees the purpose that optimization design heat exchanger.This method Consideration is comprehensive, strong operability, can be calibrated
The efficiency for really evaluating heat-exchangers of the plate type is horizontal, horizontal for improving the running efficiency of heat-exchangers of the plate type, promotes novel
Exploitation, manufacture and the application of energy-efficient heat-exchangers of the plate type have directive significance.
Claims (5)
1. a kind of heat-exchangers of the plate type efficiency evaluation method, which is characterized in that include the following steps：
(1) the efficiency parameter of heat-exchangers of the plate type is obtained；
(2) efficiency characteristic function is established based on the net energy that heat-exchangers of the plate type is exchanged using the efficiency parameter；
(3) the optimal overall heat-transfer coefficient for determining heat-exchangers of the plate type obtains optimal energy efficiency indexes in conjunction with the efficiency characteristic function.
2. heat-exchangers of the plate type efficiency evaluation method according to claim 1, which is characterized in that the step (3) is gone back afterwards
Efficiency ratio is calculated to determine heat-exchangers of the plate type efficiency hierarchical level including the use of efficiency characteristic function and optimal energy efficiency indexes
The step of.
3. heat-exchangers of the plate type efficiency evaluation method according to claim 1, which is characterized in that in the step (1)
Efficiency parameter includes mean temperature difference, fluid heat transfer area, cold-side fluid pressure drop, the heat of cold and hot two side liquid of heat-exchangers of the plate type
Side liquid pressure drop, cold-side fluid sectional area, hot side fluid cross-section product, cold-side fluid flow velocity and hot side fluid flow rate.
4. heat-exchangers of the plate type efficiency evaluation method according to claim 1, which is characterized in that built in the step (2)
Vertical efficiency characteristic function isWherein, K is overall heat-transfer coefficient,h1For cold side convective heat-transfer coefficient,u1For cold-side fluid flow velocity, b1It is cold-side fluid flow velocity to cold
The structure variable of side convective heat-transfer coefficient, a1It is cold-side fluid flow velocity to the amplitude variations of cold side convective heat-transfer coefficient, h2For hot side
Convective heat-transfer coefficient,u2For hot side fluid flow rate, b2It is hot side fluid flow rate to the knot of hot side convective heat-transfer coefficient
Structure variable, a2It is hot side fluid flow rate to the amplitude variations of hot side convective heat-transfer coefficient, Δ tmFor the cold and hot both sides of heat-exchangers of the plate type
The mean temperature difference of fluid；A0For fluid heat transfer area；ΔP1For cold-side fluid pressure drop, Δ P2For hot side fluid pressure drop；A1For
Cold-side fluid sectional area, A2It is accumulated for hot side fluid cross-section.
5. heat-exchangers of the plate type efficiency evaluation method according to claim 4, which is characterized in that in the step (3)
Optimal overall heat-transfer coefficientWherein,
Δtm1For the mean temperature difference of cold-side fluid and cold and hot side contacts wooden partition；Δtm2For the flat of hot side fluid and cold and hot side contacts wooden partition
Mean temperature difference；The optimal energy efficiency indexes are
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| CN201810148955.XA CN108446829B (en) | 2018-02-13 | 2018-02-13 | Energy efficiency evaluation method for plate heat exchanger |
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Cited By (2)
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| CN110376239A (en) * | 2019-05-20 | 2019-10-25 | 西安交通大学 | The quantitative measurement method of grease working medium shell-and-tube heat exchanger efficiency |
| CN113390661A (en) * | 2021-06-08 | 2021-09-14 | 西安交通大学 | Energy efficiency testing and evaluating method for plate type heat exchanger unit for heat supply |
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